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电力大数据:2019,22(7):-
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导线覆冰过程中水滴尺寸参数影响的 碰撞率分析
李汶江1, 周双勇1, 邹书涵1, 唐娟1, 吕蓓蕾2
(1.国网重庆市电力公司检修分公司;2.重庆大学)
Collision Efficiency Considering Water Droplet Size Parameter During Icing Acceleration of Transmission Lines
Li Wenjiang1, zhou shuangyong1, Zou shuhan1, tang juan1, Lv Belei2
(1.Maintenance Branch of Chongqing State Grid Power Company;2.Chongqing Universtity)
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投稿时间:2019-01-18    修订日期:2019-03-01
中文摘要: 导线覆冰增长预测中,碰撞率是一项不可忽视的重要参数,该参数的合理获取与实时环境参数如风速、水滴直径、温湿度、气压及导线直径等密切相关。水滴中值直径(MVD)常用来近似整个滴谱,但计算表明,对于不同体积百分比的水滴分布,基于MVD的碰撞率与实际滴谱碰撞率相差较大。论文提出了新的体积权重直径(VWD)来近似滴谱,分析三种水滴尺寸参数的碰撞率:基于VWD的碰撞率更接近实际滴谱的碰撞率,相对误差较小。解析了基于VWD的碰撞率精度更高的数学原理,讨论了该方法的适用范围。同时,通过试验的对比分析,计算碰撞率和实测碰撞率相对误差较小,覆冰质量接近,验证了该方法进行覆冰预测的可靠性,进一步将其应用于实际输电线路的覆冰厚度预测。
中文关键词: 高压输电线路  覆冰  VWD  碰撞率
Abstract:Collision efficiency as an important parameter should not be ignored, and mainly depends on the real-time environment parameters such as wind velocity, water droplet diameter, temperature, humidity, atmospheric pressure and conductor diameter. Though median volume diameter (MVD) as a representative water droplet size parameters is often used to approximate the whole droplet size spectrum, however, as for different volume fraction of droplet size distribution, great relative error is between the calculated collision efficiency and real collision efficiency. A novel volume weighted diameter (VWD) is proposed to approximate the water droplet size spectrum, and the results are compared with those using the median volume diameter and the entire droplet size spectrum. The results show that this parameterization provides a more stable approximation than the median volume diameter when the collision efficiency changes. And then, the mathematic explanation is given to the higher precision based on VWD, and the application range of this method is discussed. In addition, the calculated collision efficiency is compared with measured value based on lab tests, the smaller relative error and good approximate icing mass have proved the reliability of the proposed method, and is also applied to predict the icing thickness of the practical transmission line.
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基金项目:国家自然科学基金资助项目(51779021)
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